restructuring

1 files changed, 397 insertions, 0 deletions

diff --git a/src/pages/confirm-create-reserve.tsx b/src/pages/confirm-create-reserve.tsx
new file mode 100644
index 000000000..372f11a4b
--- /dev/null
+++ b/src/pages/confirm-create-reserve.tsx
@@ -0,0 +1,397 @@
+/*
+ This file is part of TALER
+ (C) 2015-2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+
+/**
+ * Page shown to the user to confirm creation
+ * of a reserve, usually requested by the bank.
+ *
+ * @author Florian Dold
+ */
+
+import {amountToPretty, canonicalizeBaseUrl} from "src/helpers";
+import {
+  AmountJson, CreateReserveResponse,
+  ReserveCreationInfo, Amounts,
+  Denomination,
+} from "src/types";
+import {getReserveCreationInfo} from "src/wxApi";
+import {ImplicitStateComponent, StateHolder} from "src/components";
+
+"use strict";
+
+
+function delay<T>(delayMs: number, value: T): Promise<T> {
+  return new Promise<T>((resolve, reject) => {
+    setTimeout(() => resolve(value), delayMs);
+  });
+}
+
+class EventTrigger {
+  triggerResolve: any;
+  triggerPromise: Promise<boolean>;
+
+  constructor() {
+    this.reset();
+  }
+
+  private reset() {
+    this.triggerPromise = new Promise<boolean>((resolve, reject) => {
+      this.triggerResolve = resolve;
+    });
+  }
+
+  trigger() {
+    this.triggerResolve(false);
+    this.reset();
+  }
+
+  async wait(delayMs: number): Promise<boolean> {
+    return await Promise.race([this.triggerPromise, delay(delayMs, true)]);
+  }
+}
+
+
+function renderReserveCreationDetails(rci: ReserveCreationInfo|null) {
+  if (!rci) {
+    return <p>
+      Details will be displayed when a valid exchange provider URL is entered.</p>
+  }
+
+  let denoms = rci.selectedDenoms;
+
+  let countByPub: {[s: string]: number} = {};
+  let uniq: Denomination[] = [];
+
+  denoms.forEach((x: Denomination) => {
+    let c = countByPub[x.denom_pub] || 0;
+    if (c == 0) {
+      uniq.push(x);
+    }
+    c += 1;
+    countByPub[x.denom_pub] = c;
+  });
+
+  function row(denom: Denomination) {
+    return (
+      <tr>
+        <td>{countByPub[denom.denom_pub] + "x"}</td>
+        <td>{amountToPretty(denom.value)}</td>
+        <td>{amountToPretty(denom.fee_withdraw)}</td>
+        <td>{amountToPretty(denom.fee_refresh)}</td>
+        <td>{amountToPretty(denom.fee_deposit)}</td>
+      </tr>
+    );
+  }
+
+  let withdrawFeeStr = amountToPretty(rci.withdrawFee);
+  let overheadStr = amountToPretty(rci.overhead);
+
+  return (
+    <div>
+      <p>{`Withdrawal fees: ${withdrawFeeStr}`}</p>
+      <p>{`Rounding loss: ${overheadStr}`}</p>
+      <table>
+        <thead>
+        <th># Coins</th>
+        <th>Value</th>
+        <th>Withdraw Fee</th>
+        <th>Refresh Fee</th>
+        <th>Deposit fee</th>
+        </thead>
+        <tbody>
+        {uniq.map(row)}
+        </tbody>
+      </table>
+    </div>
+  );
+}
+
+
+function getSuggestedExchange(currency: string): Promise<string> {
+  // TODO: make this request go to the wallet backend
+  // Right now, this is a stub.
+  const defaultExchange: {[s: string]: string} = {
+    "KUDOS": "https://exchange.demo.taler.net",
+    "PUDOS": "https://exchange.test.taler.net",
+  };
+
+  let exchange = defaultExchange[currency];
+
+  if (!exchange) {
+    exchange = ""
+  }
+
+  return Promise.resolve(exchange);
+}
+
+
+function WithdrawFee(props: {reserveCreationInfo: ReserveCreationInfo|null}): JSX.Element {
+  if (props.reserveCreationInfo) {
+    let {overhead, withdrawFee} = props.reserveCreationInfo;
+    let totalCost = Amounts.add(overhead, withdrawFee).amount;
+    return <p>Withdraw fees: {amountToPretty(totalCost)}</p>;
+  }
+  return <p />;
+}
+
+
+interface ExchangeSelectionProps {
+  suggestedExchangeUrl: string;
+  amount: AmountJson;
+  callback_url: string;
+  wt_types: string[];
+}
+
+
+class ExchangeSelection extends ImplicitStateComponent<ExchangeSelectionProps> {
+  statusString: StateHolder<string|null> = this.makeState(null);
+  reserveCreationInfo: StateHolder<ReserveCreationInfo|null> = this.makeState(
+    null);
+  url: StateHolder<string|null> = this.makeState(null);
+  detailCollapsed: StateHolder<boolean> = this.makeState(true);
+
+  updateEvent = new EventTrigger();
+
+  constructor(props: ExchangeSelectionProps) {
+    super(props);
+    this.onUrlChanged(props.suggestedExchangeUrl || null);
+  }
+
+
+  renderAdvanced(): JSX.Element {
+    if (this.detailCollapsed() && this.url() !== null && !this.statusString()) {
+      return (
+        <button className="linky"
+                onClick={() => this.detailCollapsed(false)}>
+          view fee structure / select different exchange provider
+        </button>
+      );
+    }
+    return (
+      <div>
+        <h2>Provider Selection</h2>
+        <label>URL: </label>
+        <input className="url" type="text" spellCheck={false}
+               value={this.url()!}
+               key="exchange-url-input"
+               onInput={(e) => this.onUrlChanged((e.target as HTMLInputElement).value)}/>
+        <br />
+        {this.renderStatus()}
+        <h2>Detailed Fee Structure</h2>
+        {renderReserveCreationDetails(this.reserveCreationInfo())}
+      </div>)
+  }
+
+  renderFee() {
+    if (!this.reserveCreationInfo()) {
+      return "??";
+    }
+    let rci = this.reserveCreationInfo()!;
+    let totalCost = Amounts.add(rci.overhead, rci.withdrawFee).amount;
+    return `${amountToPretty(totalCost)}`;
+  }
+
+  renderFeeStatus() {
+    if (this.reserveCreationInfo()) {
+      return (
+        <p>
+          The exchange provider will charge
+          {" "}
+          {this.renderFee()}
+          {" "}
+          in fees.
+        </p>
+      );
+    }
+    if (this.url() && !this.statusString()) {
+      let shortName = URI(this.url()!).host();
+      return <p>
+        Waiting for a response from
+        {" "}
+        <em>{shortName}</em>
+      </p>;
+    }
+    if (this.statusString()) {
+      return (
+        <p>
+          <strong style={{color: "red"}}>A problem occured, see below.</strong>
+        </p>
+      );
+    }
+    return (
+      <p>
+        Information about fees will be available when an exchange provider is selected.
+      </p>
+    );
+  }
+
+  render(): JSX.Element {
+    return (
+      <div>
+        <p>
+          {"You are about to withdraw "}
+          <strong>{amountToPretty(this.props.amount)}</strong>
+          {" from your bank account into your wallet."}
+        </p>
+        {this.renderFeeStatus()}
+        <button className="accept"
+                disabled={this.reserveCreationInfo() == null}
+                onClick={() => this.confirmReserve()}>
+          Accept fees and withdraw
+        </button>
+        <br/>
+        {this.renderAdvanced()}
+      </div>
+    );
+  }
+
+
+  confirmReserve() {
+    this.confirmReserveImpl(this.reserveCreationInfo()!,
+                            this.url()!,
+                            this.props.amount,
+                            this.props.callback_url);
+  }
+
+  /**
+   * Do an update of the reserve creation info, without any debouncing.
+   */
+  async forceReserveUpdate() {
+    this.reserveCreationInfo(null);
+    if (!this.url()) {
+      this.statusString(i18n`Error: URL is empty`);
+      return;
+    }
+
+    this.statusString(null);
+    let parsedUrl = URI(this.url()!);
+    if (parsedUrl.is("relative")) {
+      this.statusString(i18n`Error: URL may not be relative`);
+      return;
+    }
+
+    try {
+      let r = await getReserveCreationInfo(this.url()!,
+                                           this.props.amount);
+      console.log("get exchange info resolved");
+      this.reserveCreationInfo(r);
+      console.dir(r);
+    } catch (e) {
+      console.log("get exchange info rejected");
+      if (e.hasOwnProperty("httpStatus")) {
+        this.statusString(`Error: request failed with status ${e.httpStatus}`);
+      } else if (e.hasOwnProperty("errorResponse")) {
+        let resp = e.errorResponse;
+        this.statusString(`Error: ${resp.error} (${resp.hint})`);
+      }
+    }
+  }
+
+  reset() {
+    this.statusString(null);
+    this.reserveCreationInfo(null);
+  }
+
+  confirmReserveImpl(rci: ReserveCreationInfo,
+                     exchange: string,
+                     amount: AmountJson,
+                     callback_url: string) {
+    const d = {exchange, amount};
+    const cb = (rawResp: any) => {
+      if (!rawResp) {
+        throw Error("empty response");
+      }
+      // FIXME: filter out types that bank/exchange don't have in common
+      let wire_details = rci.wireInfo;
+      if (!rawResp.error) {
+        const resp = CreateReserveResponse.checked(rawResp);
+        let q: {[name: string]: string|number} = {
+          wire_details: JSON.stringify(wire_details),
+          exchange: resp.exchange,
+          reserve_pub: resp.reservePub,
+          amount_value: amount.value,
+          amount_fraction: amount.fraction,
+          amount_currency: amount.currency,
+        };
+        let url = URI(callback_url).addQuery(q);
+        if (!url.is("absolute")) {
+          throw Error("callback url is not absolute");
+        }
+        console.log("going to", url.href());
+        document.location.href = url.href();
+      } else {
+        this.reset();
+        this.statusString(
+          `Oops, something went wrong.` +
+          `The wallet responded with error status (${rawResp.error}).`);
+      }
+    };
+    chrome.runtime.sendMessage({type: 'create-reserve', detail: d}, cb);
+  }
+
+  async onUrlChanged(url: string|null) {
+    this.reset();
+    this.url(url);
+    if (url == undefined) {
+      return;
+    }
+    this.updateEvent.trigger();
+    let waited = await this.updateEvent.wait(200);
+    if (waited) {
+      // Run the actual update if nobody else preempted us.
+      this.forceReserveUpdate();
+      this.forceUpdate();
+    }
+  }
+
+  renderStatus(): any {
+    if (this.statusString()) {
+      return <p><strong style={{color: "red"}}>{this.statusString()}</strong></p>;
+    } else if (!this.reserveCreationInfo()) {
+      return <p>Checking URL, please wait ...</p>;
+    }
+    return "";
+  }
+}
+
+export async function main() {
+  const url = URI(document.location.href);
+  const query: any = URI.parseQuery(url.query());
+  const amount = AmountJson.checked(JSON.parse(query.amount));
+  const callback_url = query.callback_url;
+  const bank_url = query.bank_url;
+  const wt_types = JSON.parse(query.wt_types);
+
+  try {
+    const suggestedExchangeUrl = await getSuggestedExchange(amount.currency);
+    let args = {
+      wt_types,
+      suggestedExchangeUrl,
+      callback_url,
+      amount
+    };
+
+    ReactDOM.render(<ExchangeSelection {...args} />, document.getElementById(
+      "exchange-selection")!);
+
+  } catch (e) {
+    // TODO: provide more context information, maybe factor it out into a
+    // TODO:generic error reporting function or component.
+    document.body.innerText = `Fatal error: "${e.message}".`;
+    console.error(`got error "${e.message}"`, e);
+  }
+}